cavil vs sophism

cavil

noun
  • A petty or trivial objection or criticism. 

verb
  • To criticise for petty or frivolous reasons. 

sophism

noun
  • Sophistic, fallacious reasoning or argumentation. 

  • A flawed argument, superficially correct in its reasoning, usually designed to deceive. 

  • The school of the sophists in antiquity; their beliefs and method of teaching philosophy and rhetoric. 

  • An intentional fallacy. 

How often have the words cavil and sophism occurred in a corpus of books? (source: Google Ngram Viewer )